import pandas as pd
import numpy as np
from matplotlib import pyplot as plt


# example using pandas, display a chart.
def display_chart():
    df = pd.DataFrame(np.random.rand(10, 5), columns=list('ABCDE'))
    print(df.head())
    df.plot()
    plt.show()

def main():
    print("Hello, World!")
    display_chart()

if __name__ == '__main__':
    main()